층류 동축류 제트 부상화염에서의 자기진동에 관한 연구
A Study on Self-excitation in Laminar Lifted Coflow-jet Flames
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A study on laminar jet flames in coflow air diluted with helium has been conducted to investigate selfexcitationsfor various propane mole fractions and nozzle exit velocities. The stability map was representedas a function of nozzle exit velocity and fuel mole fraction for propane. The results show that two types ofself-excitation were observed : (1) buoyancy-driven self-excitation (hereafter called BDSE) and (2) Lewisnumberinduced-self-excitation coupled with (1) (hereafter called LCB) near extinction limit for 9.4 mmnozzle diameter. It was shown that with 0.95 mm nozzle diameter, Lewis-number-induced self-excitation(hereafter LISE) and BDSE could be separated. The differences between the two self-excitations were shownand discussed.
Abstract
A study on laminar jet flames in coflow air diluted with helium has been conducted to investigate selfexcitationsfor various propane mole fractions and nozzle exit velocities. The stability map was representedas a function of nozzle exit velocity and fuel mole fraction for propane. The results show that two types ofself-excitation were observed : (1) buoyancy-driven self-excitation (hereafter called BDSE) and (2) Lewisnumberinduced-self-excitation coupled with (1) (hereafter called LCB) near extinction limit for 9.4 mmnozzle diameter. It was shown that with 0.95 mm nozzle diameter, Lewis-number-induced self-excitation(hereafter LISE) and BDSE could be separated. The differences between the two self-excitations were shownand discussed.
참고문헌 (13)
- Chung, S. H., "On the Characteristics of Laminar Lifted Flames in a Nonpremixed Jet", Combust. flame, 86, pp.62~72 (1991)
- Lee, B. J., "Stabilization of Lifted Tribrachial Flames in a Laminar Nonpremixed Jet", Combust. Flame, 109, pp.163~182 (1997)
- Won, S. H., "Lifted Flame Stabilization in Developing and Developed Regions of Coflow Jets for Highly Diluted Propane", Proc. Combust. Inst, 28, pp.2093~2099 (2000)
- Won, S. H., "Normal and Microgravity Experiment of Oscillating Lifted Flames on Coflow", Proc. Combust. Inst., 29 (2002)
- M. Furi., "Non-premixed jet flame pulsations near extinction", Proc. Combust. Inst, 28, pp.831~838 (2000)
- S. H. Yoon., "Self-excitation in laminar lifted flames diluted with nitrogen", Combust. flame, 158, pp.1960~1969 (2011)
- S. H. Yoon., "Experimental study on self-excitations in nitrogen-diluted laminar lifted butane flames", Fuel, 91, pp.51~60 (2012)
- W. J. Lee., "Lewis-number-induced and buoyancy-driven self-excitations in nitrogen-diluted laminar nonpremixed free-jet flames", Fuel, 112, pp.366~374 (2013)
- Kurdyumov., "Stabilization and onset of oscillation of an edge-flame in the nearwake of a fuel injector", Proc. Comb. Inst., 31, pp.909~917 (2007)
- Kurdyumov., "Dynamics of an edge flame in a mixing layer", Comb. Flame, 139, pp.329~339 (2004)
- Kurdyumov., "Radiation losses as a driving mechanism for flame oscillations", Proc. Comb. Inst, 29, pp.45~52 (2002)
- A Fortran program for modeling steady laminar one-dimensional premixed flames, "Kee, R. J.", Sandia National Laboratories, ~, pp.Report No. SAND85-8240 (1993)